I'm currently hunting for specific Game Boy cartridge PCBs. Specifically, I'm trying to figure out the differences between A and Z PCBs. Basically, I have a little list of supposedly Z-variant PCBs found in games and I'm collecting those. And that's my reason
So far I got a Z02 and a Z04 cartridge which feature some differences compared to their A?? companions.

So if you have a huge body of games and would feel like sharing close-ups of Z?? PCBs, I'd appreciate that

Yeah, I do have a lot of games but I'm afraid opening them all up for PCB photos is something I won't find the time for. I don't even manage to keep up with scanning the game boxes, and I need those for one of my own projects